I'm scared to get a jobWatch
Have a look online and see if there are any positions that you can apply for like that. I managed to get my first job by just emailing my CV to a local restaurant. Try not to worry about potentially making mistakes, I know its hard, but every one makes them and its just what makes us human.
Think about it- when someone else does something slightly embarrassing, do you care? No, and that's how everyone else feels as well when you talk or when you say something weird or embarrassing. So don't be afraid and get out there and start looking for work and make something of your yourself! The world is pretty much your oyster.
I'm the same age as you and I am pretty shy around new people but I'm becoming way more confident ever since I realised how little people actually judge you. You should believe that you are exceptional and that you will be the best at what you do- that's how I gained confidence.